Hay-derrick.



No. 807,091. PATENTED DEC. 12, 1905. A. ROUNSBURG.

HAY DERRICK. APPLIOATION FILED JUNE 17, 1905.

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H by I 1 fig I Attorneys ANTON ROUNSBURG, OF LEWELLEN, NEBRASKA.

HAY-.-DERRICK- Specification of Letters Patent.

Patented Dec. 12, 1905.

Application filed June 17, 1905. SerialNo. 265,763.

To aZZ whom, it may concern:

Be it known that I, ANTON ROUNSBURG, a citizen of the United States, residing at Lewellen, in the county of Denel and State of Nebraska, have invented a new and useful Hay- Derrick, of which the following is a specification.

- This invention relates to derricks for elevating hay, straw, and similar products in building stacks and for like purposes, and has for its object to improve the construction and increase the efliciency and utility of devices of this character.

With these and other objects in view, which will appear as the nature of the invention is better understood, the same consists in certain novel features of construction, as hereinafter fully described and claimed.

In the accompanying drawings, forming a part of this specification, and in which corresponding parts are denoted by like designating characters, is illustrated the preferred form of embodiment of the invention capable of carrying thesame into practical operation, it being understood that the invention is not necessarily limited thereto, as various changes in the shape, proportions, and general assemblage of the parts may be resorted to without departing from the principle of the invention or sacrificing any of its advantages.

In the drawings, Figure 1 is a side elevation. Fig. 2 is a plan view of the improved device. Fig. 3 is a sectional detail of a portion of the supporting-framework and maststep. Fig. 4 is a plan view of the head plate or frame of the mast-support. Fig. 5 is a sectional detail of a portion of the boom and the truss-cable-straining mechanism.

The improved device comprises spaced runner members 11, connected by transverse stay members 12, and a mast 13, stepped at 14 upon the central transverse member 12 and supported for rotation in a plate or frame 15, thelatter in turn supported from the baseframe by diagonal braces 16. The lower ends of the diagonal braces are further supported by stay members 17 18, secured upon the upper sides of the runners 1O 11, and by stay members 19 20, extending over the upper faces of the transverse members 12. This makes a very strong and rigid base and mast supporting frame, which will effectually resist all the various strains to which it will be subjected when in operation.

The head plate or frame will preferably be of cast iron or steel, while the other portions of the framework and the mast will be of wood.

The boom portion of the device consists of two members 21 22, spaced apart by chocks 23, disposed at suitable intervals and carrying cable-sheaves 24 25 at the ends mounted for rotation between the spaced side members.

The boom members are pivoted upon opposite sides of the mast 13 near the upper end, as at 26, the mast being reduced in width to receive the boom members, and provided also with a cable-sheave 27 in its upper end.

Mounted for rotation through the shorter end of the boom members is a shaft 28, carrying cable-drums 29 30 on its ends outside the boom members and with a ratchet-wheel 31 between the boom members, the ratchetwheel having a pawl 32 for engaging its teeth and held in yieldable contact therewith by a spring 33.

Truss-cables 34 35 are each connected by one end, as at 36 37 to the longer-ends of the boom members and extend over a strut 38 to the drums 29 30, to which they are respectively connected.

The shaft 28 is provided with means, such 6 as a square end 40, for the attachment of an operating-crank to wind up the drums, and

thus strain the truss-cables to any required extent. By this means the boom may be prevented from sagging, and any deflection caused by abnormal strains or from any Weakness in the construction of the boom may be quickly and easily corrected.

A relatively powerful spring 41 will couple the shorter end of the boom to the mast 13 to maintain the boom yieldably in operative position and automatically return it to its normal position when the strains are removed.

Numerous eye bolts 42 will be attached to the base-frame to receive the guide-block 43 of the hoisting-cable 44, so that the latter may be conducted in any required direction from the derrick.

The mast and boom may be of any required length and all the parts may be increased or decreased in size, as required.

It will thus be noted that a very efiicient, strong, and durable structure or derrick is produced, which may be inexpensively manufactured and well adapted for the purposes described.

. Having thus described the invention, what is claimed is A 1. In a derrick structure, a base-platform,

a mast mounted for rotation upon said platform, a guide-frame engaging said mast above said platform, diagonal brace members between said guide-frame and platform, a boom mounted to swing vertically upon and rotate with said mast, cable-guide pulleys carried by said boom for receiving the hoisting-cable, and a spring connecting the shorter end of said boom and said mast.

2. In a derrick structure, a platform comprising spaced side members havingupwardlyinclined ends and spaced transverse members connecting the side members, a mast stepped for rotation upon one of said transverse members, a guide-plate engaging said mast intermediately of the same, diagonal brace members between said guide-plate and side memboom mounted to swing vertically upon and rotate with said mast.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

ANTON ROUNSBURG.

Witnesses:

T. W. CAMPBELL, F. L. MELINS. 

